There's an even quicker way to access all your apps, whether you're on the Desktop or the Start screen: Simply create an Applications folder to house them all. First, run File Explorer then navigate to the Desktop and create a new folder and name it:
On the Desktop and in File Explorer, the folder will be called Applications. Double-click on it to see a list of all your applications, including Windows 8 Store apps, traditional Desktop applications and many system apps such as Control Panel.
The folder, however, does not show up on the Start screen. It's simple to put it there, though. Right-click on it on the Desktop or in File Explorer and select 'Pin to Start'. It should now pinned to the Start screen.